Learning TIG/aluminium welding
I've had so little training in this that I will skip this topic. I
don't know how to deal with the adherent oxide disrupting weld-pool
flow and preventing god fusion welding.
Theoretical comment on TIG/aluminium welding
The physical characteristics of Aluminium (American spelling;
aluminum) which make it the big exception in TIG welding are:
- the low melting point of the metal (around 600Celsius)
- the high melting point of its oxide (Al2O3, alumina) at over
2000Celsius
- the strong adherence of the oxide to the metal (hence its
passivity against most corrosion!)
Hence there is a problems getting a clean melt and weld-pool flow. In
outline, the answer is to run an alternating-current arc, with the
reverse portion blowing off the oxide - but the chain-reaction of
ramifications is immense, making TIG/aluminium welding rather unique.